한국분말야금학회지 Vol. 26 No. 5 (p.405-409)

Li2O-Bi2O3 첨가가 Pb(Mg1/3Nb2/3)0.65Ti0.35O3 세라믹의 압전 특성에 미치는 영향

Effect of Li2O-Bi2O3 Addition on the Piezoelectric Properties of Pb(Mg1/3Nb2/3)0.65Ti0.35O3 Ceramics
키워드 :
PMN-PT,Li2O-Bi2O3,Low-temperature sintering,Piezoelectrics,Cu electrode

목차

Abstract
1. 서 론
2. 실험방법
3. 결과 및 고찰
4. 결 론
References

초록

Piezoelectric ceramic specimens with the Pb(Mg1/3Nb2/3)0.65Ti0.35O3 (PMN-PT) composition are prepared by the solid state reaction method known as the “columbite precursor” method. Moreover, the effects of the Li2O-Bi2O3 additive on the microstructure, crystal structure, and piezoelectric properties of sintered PMN-PT ceramic samples are investigated. The addition of Li2O-Bi2O3 lowers the sintering temperature from 1,200oC to 950oC. Moreover, with the addition of >5 wt.% additive, the crystal structure changes from tetragonal to rhombohedral. Notably, the sample with 3 wt.% additive exhibits excellent piezoelectric properties (d33 = 596 pC/N and Kp = 57%) and a sintered density of 7.92 g/cm3 after sintering at 950oC. In addition, the sample exhibits a curie temperature of 138.6oC at 1 kHz. Finally, the compatibility of the sample with a Cu electrode is examined, because the energy-dispersive X-ray spectroscopy data indicate the absence of interdiffusion between Cu and the ceramic material.